Log email delivery errors (#14403).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@12010 e93f8b46-1217-0410-a6f0-8f06a7374b81
Removed dead code.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@12011 e93f8b46-1217-0410-a6f0-8f06a7374b81